| 摘要 |
The present invention relates to an intervertebral disc prosthesis preferably comprising at least three pieces including an upper plate (1), a lower plate (2) and a mobile core (3) at least in relation to the lower plate (2), co-operation means (23, 33) allowing to limit or eliminate the movements of the core (3) in relation to the lower plate (2), in translation and in rotation, respectively, about an axis substantially parallel to the lower plate (2) and about an axis substantially perpendicular to the lower plate (2), at least one part of the surface of at least one plate being concave and complementary with a convex surface (30) of the core (3), with which it is in contact, wherein the tip (31) of the convex surface (30) of the core (3) is off centre, in at least one direction, in relation to the centre (32) of this convex surface (30). |
| 主权项 |
1. An intervertebral disc prosthesis comprising at least three pieces including a first plate, (1), a second plate, (2) and a mobile core (3), at least in rotation, at least in relation to one of the plates (1, 2), the core (3) having a curved surface in contact with at least a part of a complementary curved surface of the first plate (1), and a substantially flat surface in contact with at least a part of a substantially flat of the second, male and female co-operation means (23, 33) situated near the periphery of the second plate (2) and of the core (3) allowing, to limit or prevent, the movements in translation of the core in relation to the second plate to along an axis substantially parallel to the substantially flat surfaces, and allowing to limit or prevent the movements in rotation of the core in relation to the second plate, about an axis substantially perpendicular to the substantially flat surfaces, at least one part of the surface of at least one plate being concave and complementary with a convex surface (30) of the core (3), with which it is in contact, wherein the tip (31) of the convex surface (30) of the core (3) is off centre, in at least one direction, in relation to the geometric centre (32) of this convex surface (30) of the core (3). |
